Uraninite and chalcopyrite. Port Radium, Northwest Territories, Canada

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Botryoidal, collomorphic uraninite (light grey, centre) encloses a rhombic carbonate (dark grey, centre). Fine-grained chalcopyrite (yellow, centre bottom) is abundant within uraninite. The carbonate gangue shows bireflectance (light and darker grey, top). Grey area (bottom) is resin.

Polished block, plane polarized light, x 40, air

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